Resin Barrier
Paraffinic petroleum fractions migrate through corrugated board structures during secondary packaging cycles. Iso alkane migration compromises food contact safety when secondary cartons transfer mineral oils into primary folding boxboards. Temperature gradients inside warehouses accelerate capillary action across cellulose fibres.
Converting plants apply aqueous barrier coatings to stop hydrocarbon penetration. Barrier thickness and coat weight dictate the retention threshold of aliphatic chains.
Molecular Weight
Low molecular weight fractions demonstrate higher vapor pressures and diffuse rapidly across paper interfaces. High molecular weight hydrocarbons remain trapped within the bulk matrix of the substrate because steric hindrance restricts mobility. Molecular size determines diffusion coefficients within dense polysaccharide networks.
Chemists measure carbon chain distributions using gas chromatography to isolate specific fractions. Long carbon chains resist thermal activation during hot wire cutting processes on packaging lines.
Diffusion Kinetics
Fickian diffusion governs mass transport rates through porous paper substrates. Concentration gradients drive molecules from high saturation zones in recycled corrugated cases toward pristine food wrappers. Ambient humidity alters capillary resistance and modifies overall absorption speeds.
Packaging engineers calculate breakthrough times by subjecting laminate sheets to elevated thermal chambers. Extended storage durations increase cumulative transfer levels until equilibrium is reached between interacting packaging layers.
